This is a discussion on Lean Bank 1 And Multiple Misfires? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Whats up?
Recently bought an 02 wrx, Knew it had the CEL But it ran and drov,e So what did ...

Lean Bank 1 And Multiple Misfires?

Recently bought an 02 wrx, Knew it had the CEL But it ran and drov,e So what did I Care? Im a mechanic. BUT My simple minded brain didnt take into consideration that i barely have time for myself.

So simply Lean Bank1 Code, and p0301 and p0304.. Thinking Possible 02 sensor.. Didnt get a chance to test anything yet and since i work at an Acura Dealership Our scanners are purely for acura cars...So I cant look at, Injector pulse and Stuff like that atm..Any ideas? Ill be happy to answer any ?'s

Was it PO171? Check the intake for a leak, clean the MAF, check the FPR reference line, and check for vacuum or boost leaks.

For the misfires, check the connections on the coils.

All this assuming the car has the correct parts fitted (if the car is modified, list all modifications).

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and story of my life, im a BMW tech. and drive around with a cel 24/7... i used my AccessPort and its reading lean on bank one and i have 2 misfires, forgot what cylinders theyre on but im assuming the corresponding cyclinders to the lean bank. let me know what you find out .

There is no bank as the front O2 reads all cylinders. OBDII is just to generic to assume it means the same on all cars. P0171 is the front O2. Please read the stickies up top to better help you. List any mods,as certain mods cause certain issues (IE: some aftermarket intakes cause the P0171 if not tuned for). Also read the link below,which is a sticky uptop.

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